ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

The CPUID Identification Scheme
B5.3 Advanced SIMD and VFP feature identification registers
When an implementation includes one or both of the optional Advanced SIMD and VFP extensions, the
feature identification registers for the extensions are implemented in a common register block. The
extensions reside in the coprocessor space for coprocessors CP10 and CP11, and the registers are accessed
using the VMRS and VMSR instructions. For more information, see Register map of the Advanced SIMD and
VFP extension system registers on page B1-66.
Table B5-3 lists the feature identification registers for the Advanced SIMD and VFP extensions. These are
described in the remainder of this section.
When the Security Extensions are implemented, these registers are Common registers.
B5.3.1 Floating-point System ID Register (FPSID)
In ARMv7, the FPSID Register provides top-level information about the floating-point implementation.
Note
In an ARMv7 implementation that includes one or both of the Advanced SIMD and VFP extensions
the Media and VFP Feature registers provide details of the implemented VFP architecture.
The FPSID can be implemented in a system that provides only software emulation of the ARM
floating-point instructions.
The ARMv7 format of the FPSID is:
Implementer, bits [31:24]
Table B5-3 Advanced SIMD and VFP feature identification registers
System register Name Description
0b0000 FPSID See Floating-point System ID Register (FPSID)
0b0110 MVFR1 See Media and VFP Feature Register 1 (MVFR1) on page B5-38
0b0111 MVFR0 See Media and VFP Feature Register 0 (MVFR0) on page B5-36
31 24 23 22 16 15 8 7 4 3 0
Implementer
SW
Subarchitecture Part number Variant Revision
Implementer codes are the same as those used for the Main ID Register, see:
c0, Main ID Register (MIDR) on page B3-81, for a VMSA implementation
c0, Main ID Register (MIDR) on page B4-32, for a PMSA implementation.
For an implementation by ARM this field is 0x41, the ASCII code for A.
B5-34 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B